Robert, a former police officer haunted by the guilt of a witness's death during a protective assignment, seeks solace in the tranquil Lake District with his wife, Katy. They have traded their tumultuous city life for the serenity of running a guest house. However, their peaceful existence is disrupted when DCI Mark Maxwell, an old friend and former colleague, arrives with a proposition. He believes their guest house could serve as a safe house for those in need. Robert is intrigued by the idea, but will Katy support this unexpected turn in their lives?